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e8f69799 IL |
1 | /* Copyright (c) 2018, Mellanox Technologies All rights reserved. |
2 | * | |
3 | * This software is available to you under a choice of one of two | |
4 | * licenses. You may choose to be licensed under the terms of the GNU | |
5 | * General Public License (GPL) Version 2, available from the file | |
6 | * COPYING in the main directory of this source tree, or the | |
7 | * OpenIB.org BSD license below: | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or | |
10 | * without modification, are permitted provided that the following | |
11 | * conditions are met: | |
12 | * | |
13 | * - Redistributions of source code must retain the above | |
14 | * copyright notice, this list of conditions and the following | |
15 | * disclaimer. | |
16 | * | |
17 | * - Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials | |
20 | * provided with the distribution. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
24 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
26 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
27 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
28 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
29 | * SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <crypto/aead.h> | |
33 | #include <linux/highmem.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <net/dst.h> | |
37 | #include <net/inet_connection_sock.h> | |
38 | #include <net/tcp.h> | |
39 | #include <net/tls.h> | |
40 | ||
41 | /* device_offload_lock is used to synchronize tls_dev_add | |
42 | * against NETDEV_DOWN notifications. | |
43 | */ | |
44 | static DECLARE_RWSEM(device_offload_lock); | |
45 | ||
46 | static void tls_device_gc_task(struct work_struct *work); | |
47 | ||
48 | static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task); | |
49 | static LIST_HEAD(tls_device_gc_list); | |
50 | static LIST_HEAD(tls_device_list); | |
51 | static DEFINE_SPINLOCK(tls_device_lock); | |
52 | ||
53 | static void tls_device_free_ctx(struct tls_context *ctx) | |
54 | { | |
5a03bc73 | 55 | if (ctx->tx_conf == TLS_HW) { |
4799ac81 | 56 | kfree(tls_offload_ctx_tx(ctx)); |
5a03bc73 JK |
57 | kfree(ctx->tx.rec_seq); |
58 | kfree(ctx->tx.iv); | |
59 | } | |
4799ac81 BP |
60 | |
61 | if (ctx->rx_conf == TLS_HW) | |
62 | kfree(tls_offload_ctx_rx(ctx)); | |
e8f69799 | 63 | |
15a7dea7 | 64 | tls_ctx_free(NULL, ctx); |
e8f69799 IL |
65 | } |
66 | ||
67 | static void tls_device_gc_task(struct work_struct *work) | |
68 | { | |
69 | struct tls_context *ctx, *tmp; | |
70 | unsigned long flags; | |
71 | LIST_HEAD(gc_list); | |
72 | ||
73 | spin_lock_irqsave(&tls_device_lock, flags); | |
74 | list_splice_init(&tls_device_gc_list, &gc_list); | |
75 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
76 | ||
77 | list_for_each_entry_safe(ctx, tmp, &gc_list, list) { | |
78 | struct net_device *netdev = ctx->netdev; | |
79 | ||
4799ac81 | 80 | if (netdev && ctx->tx_conf == TLS_HW) { |
e8f69799 IL |
81 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, |
82 | TLS_OFFLOAD_CTX_DIR_TX); | |
83 | dev_put(netdev); | |
4799ac81 | 84 | ctx->netdev = NULL; |
e8f69799 IL |
85 | } |
86 | ||
87 | list_del(&ctx->list); | |
88 | tls_device_free_ctx(ctx); | |
89 | } | |
90 | } | |
91 | ||
92 | static void tls_device_queue_ctx_destruction(struct tls_context *ctx) | |
93 | { | |
94 | unsigned long flags; | |
95 | ||
96 | spin_lock_irqsave(&tls_device_lock, flags); | |
97 | list_move_tail(&ctx->list, &tls_device_gc_list); | |
98 | ||
99 | /* schedule_work inside the spinlock | |
100 | * to make sure tls_device_down waits for that work. | |
101 | */ | |
102 | schedule_work(&tls_device_gc_work); | |
103 | ||
104 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
105 | } | |
106 | ||
107 | /* We assume that the socket is already connected */ | |
108 | static struct net_device *get_netdev_for_sock(struct sock *sk) | |
109 | { | |
110 | struct dst_entry *dst = sk_dst_get(sk); | |
111 | struct net_device *netdev = NULL; | |
112 | ||
113 | if (likely(dst)) { | |
114 | netdev = dst->dev; | |
115 | dev_hold(netdev); | |
116 | } | |
117 | ||
118 | dst_release(dst); | |
119 | ||
120 | return netdev; | |
121 | } | |
122 | ||
123 | static void destroy_record(struct tls_record_info *record) | |
124 | { | |
7ccd4519 | 125 | int i; |
e8f69799 | 126 | |
7ccd4519 JK |
127 | for (i = 0; i < record->num_frags; i++) |
128 | __skb_frag_unref(&record->frags[i]); | |
e8f69799 IL |
129 | kfree(record); |
130 | } | |
131 | ||
d80a1b9d | 132 | static void delete_all_records(struct tls_offload_context_tx *offload_ctx) |
e8f69799 IL |
133 | { |
134 | struct tls_record_info *info, *temp; | |
135 | ||
136 | list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { | |
137 | list_del(&info->list); | |
138 | destroy_record(info); | |
139 | } | |
140 | ||
141 | offload_ctx->retransmit_hint = NULL; | |
142 | } | |
143 | ||
144 | static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) | |
145 | { | |
146 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
147 | struct tls_record_info *info, *temp; | |
d80a1b9d | 148 | struct tls_offload_context_tx *ctx; |
e8f69799 IL |
149 | u64 deleted_records = 0; |
150 | unsigned long flags; | |
151 | ||
152 | if (!tls_ctx) | |
153 | return; | |
154 | ||
d80a1b9d | 155 | ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
156 | |
157 | spin_lock_irqsave(&ctx->lock, flags); | |
158 | info = ctx->retransmit_hint; | |
6e3d02b6 | 159 | if (info && !before(acked_seq, info->end_seq)) |
e8f69799 | 160 | ctx->retransmit_hint = NULL; |
e8f69799 IL |
161 | |
162 | list_for_each_entry_safe(info, temp, &ctx->records_list, list) { | |
163 | if (before(acked_seq, info->end_seq)) | |
164 | break; | |
165 | list_del(&info->list); | |
166 | ||
167 | destroy_record(info); | |
168 | deleted_records++; | |
169 | } | |
170 | ||
171 | ctx->unacked_record_sn += deleted_records; | |
172 | spin_unlock_irqrestore(&ctx->lock, flags); | |
173 | } | |
174 | ||
175 | /* At this point, there should be no references on this | |
176 | * socket and no in-flight SKBs associated with this | |
177 | * socket, so it is safe to free all the resources. | |
178 | */ | |
9e995797 | 179 | static void tls_device_sk_destruct(struct sock *sk) |
e8f69799 IL |
180 | { |
181 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
d80a1b9d | 182 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 | 183 | |
4799ac81 | 184 | tls_ctx->sk_destruct(sk); |
e8f69799 | 185 | |
4799ac81 BP |
186 | if (tls_ctx->tx_conf == TLS_HW) { |
187 | if (ctx->open_record) | |
188 | destroy_record(ctx->open_record); | |
189 | delete_all_records(ctx); | |
190 | crypto_free_aead(ctx->aead_send); | |
191 | clean_acked_data_disable(inet_csk(sk)); | |
192 | } | |
e8f69799 IL |
193 | |
194 | if (refcount_dec_and_test(&tls_ctx->refcount)) | |
195 | tls_device_queue_ctx_destruction(tls_ctx); | |
196 | } | |
e8f69799 | 197 | |
35b71a34 JK |
198 | void tls_device_free_resources_tx(struct sock *sk) |
199 | { | |
200 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
201 | ||
202 | tls_free_partial_record(sk, tls_ctx); | |
203 | } | |
204 | ||
50180074 JK |
205 | static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, |
206 | u32 seq) | |
207 | { | |
208 | struct net_device *netdev; | |
209 | struct sk_buff *skb; | |
b5d9a834 | 210 | int err = 0; |
50180074 JK |
211 | u8 *rcd_sn; |
212 | ||
213 | skb = tcp_write_queue_tail(sk); | |
214 | if (skb) | |
215 | TCP_SKB_CB(skb)->eor = 1; | |
216 | ||
217 | rcd_sn = tls_ctx->tx.rec_seq; | |
218 | ||
219 | down_read(&device_offload_lock); | |
220 | netdev = tls_ctx->netdev; | |
221 | if (netdev) | |
b5d9a834 DM |
222 | err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, |
223 | rcd_sn, | |
224 | TLS_OFFLOAD_CTX_DIR_TX); | |
50180074 | 225 | up_read(&device_offload_lock); |
b5d9a834 DM |
226 | if (err) |
227 | return; | |
50180074 JK |
228 | |
229 | clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); | |
230 | } | |
231 | ||
e8f69799 IL |
232 | static void tls_append_frag(struct tls_record_info *record, |
233 | struct page_frag *pfrag, | |
234 | int size) | |
235 | { | |
236 | skb_frag_t *frag; | |
237 | ||
238 | frag = &record->frags[record->num_frags - 1]; | |
d8e18a51 | 239 | if (skb_frag_page(frag) == pfrag->page && |
b54c9d5b | 240 | skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { |
d8e18a51 | 241 | skb_frag_size_add(frag, size); |
e8f69799 IL |
242 | } else { |
243 | ++frag; | |
d8e18a51 | 244 | __skb_frag_set_page(frag, pfrag->page); |
b54c9d5b | 245 | skb_frag_off_set(frag, pfrag->offset); |
d8e18a51 | 246 | skb_frag_size_set(frag, size); |
e8f69799 IL |
247 | ++record->num_frags; |
248 | get_page(pfrag->page); | |
249 | } | |
250 | ||
251 | pfrag->offset += size; | |
252 | record->len += size; | |
253 | } | |
254 | ||
255 | static int tls_push_record(struct sock *sk, | |
256 | struct tls_context *ctx, | |
d80a1b9d | 257 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
258 | struct tls_record_info *record, |
259 | struct page_frag *pfrag, | |
260 | int flags, | |
261 | unsigned char record_type) | |
262 | { | |
4509de14 | 263 | struct tls_prot_info *prot = &ctx->prot_info; |
e8f69799 IL |
264 | struct tcp_sock *tp = tcp_sk(sk); |
265 | struct page_frag dummy_tag_frag; | |
266 | skb_frag_t *frag; | |
267 | int i; | |
268 | ||
269 | /* fill prepend */ | |
270 | frag = &record->frags[0]; | |
271 | tls_fill_prepend(ctx, | |
272 | skb_frag_address(frag), | |
4509de14 | 273 | record->len - prot->prepend_size, |
130b392c | 274 | record_type, |
9cd81988 | 275 | prot->version); |
e8f69799 IL |
276 | |
277 | /* HW doesn't care about the data in the tag, because it fills it. */ | |
278 | dummy_tag_frag.page = skb_frag_page(frag); | |
279 | dummy_tag_frag.offset = 0; | |
280 | ||
4509de14 | 281 | tls_append_frag(record, &dummy_tag_frag, prot->tag_size); |
e8f69799 | 282 | record->end_seq = tp->write_seq + record->len; |
d4774ac0 | 283 | list_add_tail_rcu(&record->list, &offload_ctx->records_list); |
e8f69799 | 284 | offload_ctx->open_record = NULL; |
50180074 JK |
285 | |
286 | if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) | |
287 | tls_device_resync_tx(sk, ctx, tp->write_seq); | |
288 | ||
fb0f886f | 289 | tls_advance_record_sn(sk, prot, &ctx->tx); |
e8f69799 IL |
290 | |
291 | for (i = 0; i < record->num_frags; i++) { | |
292 | frag = &record->frags[i]; | |
293 | sg_unmark_end(&offload_ctx->sg_tx_data[i]); | |
294 | sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), | |
b54c9d5b | 295 | skb_frag_size(frag), skb_frag_off(frag)); |
d8e18a51 | 296 | sk_mem_charge(sk, skb_frag_size(frag)); |
e8f69799 IL |
297 | get_page(skb_frag_page(frag)); |
298 | } | |
299 | sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); | |
300 | ||
301 | /* all ready, send */ | |
302 | return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); | |
303 | } | |
304 | ||
d80a1b9d | 305 | static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
306 | struct page_frag *pfrag, |
307 | size_t prepend_size) | |
308 | { | |
309 | struct tls_record_info *record; | |
310 | skb_frag_t *frag; | |
311 | ||
312 | record = kmalloc(sizeof(*record), GFP_KERNEL); | |
313 | if (!record) | |
314 | return -ENOMEM; | |
315 | ||
316 | frag = &record->frags[0]; | |
317 | __skb_frag_set_page(frag, pfrag->page); | |
b54c9d5b | 318 | skb_frag_off_set(frag, pfrag->offset); |
e8f69799 IL |
319 | skb_frag_size_set(frag, prepend_size); |
320 | ||
321 | get_page(pfrag->page); | |
322 | pfrag->offset += prepend_size; | |
323 | ||
324 | record->num_frags = 1; | |
325 | record->len = prepend_size; | |
326 | offload_ctx->open_record = record; | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static int tls_do_allocation(struct sock *sk, | |
d80a1b9d | 331 | struct tls_offload_context_tx *offload_ctx, |
e8f69799 IL |
332 | struct page_frag *pfrag, |
333 | size_t prepend_size) | |
334 | { | |
335 | int ret; | |
336 | ||
337 | if (!offload_ctx->open_record) { | |
338 | if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, | |
339 | sk->sk_allocation))) { | |
340 | sk->sk_prot->enter_memory_pressure(sk); | |
341 | sk_stream_moderate_sndbuf(sk); | |
342 | return -ENOMEM; | |
343 | } | |
344 | ||
345 | ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | if (pfrag->size > pfrag->offset) | |
350 | return 0; | |
351 | } | |
352 | ||
353 | if (!sk_page_frag_refill(sk, pfrag)) | |
354 | return -ENOMEM; | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static int tls_push_data(struct sock *sk, | |
360 | struct iov_iter *msg_iter, | |
361 | size_t size, int flags, | |
362 | unsigned char record_type) | |
363 | { | |
364 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4509de14 | 365 | struct tls_prot_info *prot = &tls_ctx->prot_info; |
d80a1b9d | 366 | struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); |
e8f69799 IL |
367 | int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); |
368 | struct tls_record_info *record = ctx->open_record; | |
41477662 | 369 | int tls_push_record_flags; |
e8f69799 IL |
370 | struct page_frag *pfrag; |
371 | size_t orig_size = size; | |
372 | u32 max_open_record_len; | |
373 | int copy, rc = 0; | |
374 | bool done = false; | |
375 | long timeo; | |
376 | ||
377 | if (flags & | |
378 | ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) | |
379 | return -ENOTSUPP; | |
380 | ||
381 | if (sk->sk_err) | |
382 | return -sk->sk_err; | |
383 | ||
41477662 JK |
384 | flags |= MSG_SENDPAGE_DECRYPTED; |
385 | tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; | |
386 | ||
e8f69799 | 387 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
94850257 BP |
388 | if (tls_is_partially_sent_record(tls_ctx)) { |
389 | rc = tls_push_partial_record(sk, tls_ctx, flags); | |
390 | if (rc < 0) | |
391 | return rc; | |
392 | } | |
e8f69799 IL |
393 | |
394 | pfrag = sk_page_frag(sk); | |
395 | ||
396 | /* TLS_HEADER_SIZE is not counted as part of the TLS record, and | |
397 | * we need to leave room for an authentication tag. | |
398 | */ | |
399 | max_open_record_len = TLS_MAX_PAYLOAD_SIZE + | |
4509de14 | 400 | prot->prepend_size; |
e8f69799 IL |
401 | do { |
402 | rc = tls_do_allocation(sk, ctx, pfrag, | |
4509de14 | 403 | prot->prepend_size); |
e8f69799 IL |
404 | if (rc) { |
405 | rc = sk_stream_wait_memory(sk, &timeo); | |
406 | if (!rc) | |
407 | continue; | |
408 | ||
409 | record = ctx->open_record; | |
410 | if (!record) | |
411 | break; | |
412 | handle_error: | |
413 | if (record_type != TLS_RECORD_TYPE_DATA) { | |
414 | /* avoid sending partial | |
415 | * record with type != | |
416 | * application_data | |
417 | */ | |
418 | size = orig_size; | |
419 | destroy_record(record); | |
420 | ctx->open_record = NULL; | |
4509de14 | 421 | } else if (record->len > prot->prepend_size) { |
e8f69799 IL |
422 | goto last_record; |
423 | } | |
424 | ||
425 | break; | |
426 | } | |
427 | ||
428 | record = ctx->open_record; | |
429 | copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); | |
430 | copy = min_t(size_t, copy, (max_open_record_len - record->len)); | |
431 | ||
432 | if (copy_from_iter_nocache(page_address(pfrag->page) + | |
433 | pfrag->offset, | |
434 | copy, msg_iter) != copy) { | |
435 | rc = -EFAULT; | |
436 | goto handle_error; | |
437 | } | |
438 | tls_append_frag(record, pfrag, copy); | |
439 | ||
440 | size -= copy; | |
441 | if (!size) { | |
442 | last_record: | |
443 | tls_push_record_flags = flags; | |
444 | if (more) { | |
445 | tls_ctx->pending_open_record_frags = | |
d829e9c4 | 446 | !!record->num_frags; |
e8f69799 IL |
447 | break; |
448 | } | |
449 | ||
450 | done = true; | |
451 | } | |
452 | ||
453 | if (done || record->len >= max_open_record_len || | |
454 | (record->num_frags >= MAX_SKB_FRAGS - 1)) { | |
455 | rc = tls_push_record(sk, | |
456 | tls_ctx, | |
457 | ctx, | |
458 | record, | |
459 | pfrag, | |
460 | tls_push_record_flags, | |
461 | record_type); | |
462 | if (rc < 0) | |
463 | break; | |
464 | } | |
465 | } while (!done); | |
466 | ||
467 | if (orig_size - size > 0) | |
468 | rc = orig_size - size; | |
469 | ||
470 | return rc; | |
471 | } | |
472 | ||
473 | int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
474 | { | |
475 | unsigned char record_type = TLS_RECORD_TYPE_DATA; | |
476 | int rc; | |
477 | ||
478 | lock_sock(sk); | |
479 | ||
480 | if (unlikely(msg->msg_controllen)) { | |
481 | rc = tls_proccess_cmsg(sk, msg, &record_type); | |
482 | if (rc) | |
483 | goto out; | |
484 | } | |
485 | ||
486 | rc = tls_push_data(sk, &msg->msg_iter, size, | |
487 | msg->msg_flags, record_type); | |
488 | ||
489 | out: | |
490 | release_sock(sk); | |
491 | return rc; | |
492 | } | |
493 | ||
494 | int tls_device_sendpage(struct sock *sk, struct page *page, | |
495 | int offset, size_t size, int flags) | |
496 | { | |
497 | struct iov_iter msg_iter; | |
498 | char *kaddr = kmap(page); | |
499 | struct kvec iov; | |
500 | int rc; | |
501 | ||
502 | if (flags & MSG_SENDPAGE_NOTLAST) | |
503 | flags |= MSG_MORE; | |
504 | ||
505 | lock_sock(sk); | |
506 | ||
507 | if (flags & MSG_OOB) { | |
508 | rc = -ENOTSUPP; | |
509 | goto out; | |
510 | } | |
511 | ||
512 | iov.iov_base = kaddr + offset; | |
513 | iov.iov_len = size; | |
aa563d7b | 514 | iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); |
e8f69799 IL |
515 | rc = tls_push_data(sk, &msg_iter, size, |
516 | flags, TLS_RECORD_TYPE_DATA); | |
517 | kunmap(page); | |
518 | ||
519 | out: | |
520 | release_sock(sk); | |
521 | return rc; | |
522 | } | |
523 | ||
d80a1b9d | 524 | struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, |
e8f69799 IL |
525 | u32 seq, u64 *p_record_sn) |
526 | { | |
527 | u64 record_sn = context->hint_record_sn; | |
528 | struct tls_record_info *info; | |
529 | ||
530 | info = context->retransmit_hint; | |
531 | if (!info || | |
532 | before(seq, info->end_seq - info->len)) { | |
533 | /* if retransmit_hint is irrelevant start | |
534 | * from the beggining of the list | |
535 | */ | |
d4774ac0 JK |
536 | info = list_first_entry_or_null(&context->records_list, |
537 | struct tls_record_info, list); | |
538 | if (!info) | |
539 | return NULL; | |
e8f69799 IL |
540 | record_sn = context->unacked_record_sn; |
541 | } | |
542 | ||
d4774ac0 JK |
543 | /* We just need the _rcu for the READ_ONCE() */ |
544 | rcu_read_lock(); | |
545 | list_for_each_entry_from_rcu(info, &context->records_list, list) { | |
e8f69799 IL |
546 | if (before(seq, info->end_seq)) { |
547 | if (!context->retransmit_hint || | |
548 | after(info->end_seq, | |
549 | context->retransmit_hint->end_seq)) { | |
550 | context->hint_record_sn = record_sn; | |
551 | context->retransmit_hint = info; | |
552 | } | |
553 | *p_record_sn = record_sn; | |
d4774ac0 | 554 | goto exit_rcu_unlock; |
e8f69799 IL |
555 | } |
556 | record_sn++; | |
557 | } | |
d4774ac0 | 558 | info = NULL; |
e8f69799 | 559 | |
d4774ac0 JK |
560 | exit_rcu_unlock: |
561 | rcu_read_unlock(); | |
562 | return info; | |
e8f69799 IL |
563 | } |
564 | EXPORT_SYMBOL(tls_get_record); | |
565 | ||
566 | static int tls_device_push_pending_record(struct sock *sk, int flags) | |
567 | { | |
568 | struct iov_iter msg_iter; | |
569 | ||
aa563d7b | 570 | iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); |
e8f69799 IL |
571 | return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); |
572 | } | |
573 | ||
7463d3a2 BP |
574 | void tls_device_write_space(struct sock *sk, struct tls_context *ctx) |
575 | { | |
7463d3a2 BP |
576 | if (!sk->sk_write_pending && tls_is_partially_sent_record(ctx)) { |
577 | gfp_t sk_allocation = sk->sk_allocation; | |
578 | ||
579 | sk->sk_allocation = GFP_ATOMIC; | |
41477662 JK |
580 | tls_push_partial_record(sk, ctx, |
581 | MSG_DONTWAIT | MSG_NOSIGNAL | | |
582 | MSG_SENDPAGE_DECRYPTED); | |
7463d3a2 BP |
583 | sk->sk_allocation = sk_allocation; |
584 | } | |
7463d3a2 BP |
585 | } |
586 | ||
e52972c1 | 587 | static void tls_device_resync_rx(struct tls_context *tls_ctx, |
89fec474 | 588 | struct sock *sk, u32 seq, u8 *rcd_sn) |
e52972c1 JK |
589 | { |
590 | struct net_device *netdev; | |
591 | ||
592 | if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags))) | |
593 | return; | |
594 | netdev = READ_ONCE(tls_ctx->netdev); | |
595 | if (netdev) | |
eeb2efaf JK |
596 | netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, |
597 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
598 | clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags); |
599 | } | |
600 | ||
f953d33b | 601 | void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) |
4799ac81 BP |
602 | { |
603 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
4799ac81 | 604 | struct tls_offload_context_rx *rx_ctx; |
f953d33b JK |
605 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; |
606 | struct tls_prot_info *prot; | |
4799ac81 BP |
607 | u32 is_req_pending; |
608 | s64 resync_req; | |
609 | u32 req_seq; | |
610 | ||
611 | if (tls_ctx->rx_conf != TLS_HW) | |
612 | return; | |
613 | ||
f953d33b | 614 | prot = &tls_ctx->prot_info; |
4799ac81 | 615 | rx_ctx = tls_offload_ctx_rx(tls_ctx); |
f953d33b JK |
616 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); |
617 | ||
618 | switch (rx_ctx->resync_type) { | |
619 | case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: | |
620 | resync_req = atomic64_read(&rx_ctx->resync_req); | |
621 | req_seq = resync_req >> 32; | |
622 | seq += TLS_HEADER_SIZE - 1; | |
623 | is_req_pending = resync_req; | |
624 | ||
625 | if (likely(!is_req_pending) || req_seq != seq || | |
626 | !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) | |
627 | return; | |
628 | break; | |
629 | case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: | |
630 | if (likely(!rx_ctx->resync_nh_do_now)) | |
631 | return; | |
632 | ||
633 | /* head of next rec is already in, note that the sock_inq will | |
634 | * include the currently parsed message when called from parser | |
635 | */ | |
636 | if (tcp_inq(sk) > rcd_len) | |
637 | return; | |
638 | ||
639 | rx_ctx->resync_nh_do_now = 0; | |
640 | seq += rcd_len; | |
641 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
642 | break; | |
643 | } | |
644 | ||
645 | tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); | |
646 | } | |
647 | ||
648 | static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, | |
649 | struct tls_offload_context_rx *ctx, | |
650 | struct sock *sk, struct sk_buff *skb) | |
651 | { | |
652 | struct strp_msg *rxm; | |
653 | ||
654 | /* device will request resyncs by itself based on stream scan */ | |
655 | if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) | |
656 | return; | |
657 | /* already scheduled */ | |
658 | if (ctx->resync_nh_do_now) | |
659 | return; | |
660 | /* seen decrypted fragments since last fully-failed record */ | |
661 | if (ctx->resync_nh_reset) { | |
662 | ctx->resync_nh_reset = 0; | |
663 | ctx->resync_nh.decrypted_failed = 1; | |
664 | ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; | |
665 | return; | |
666 | } | |
667 | ||
668 | if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) | |
669 | return; | |
670 | ||
671 | /* doing resync, bump the next target in case it fails */ | |
672 | if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) | |
673 | ctx->resync_nh.decrypted_tgt *= 2; | |
674 | else | |
675 | ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; | |
676 | ||
677 | rxm = strp_msg(skb); | |
678 | ||
679 | /* head of next rec is already in, parser will sync for us */ | |
680 | if (tcp_inq(sk) > rxm->full_len) { | |
681 | ctx->resync_nh_do_now = 1; | |
682 | } else { | |
683 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
684 | u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; | |
685 | ||
686 | memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); | |
687 | tls_bigint_increment(rcd_sn, prot->rec_seq_size); | |
688 | ||
689 | tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, | |
690 | rcd_sn); | |
691 | } | |
4799ac81 BP |
692 | } |
693 | ||
694 | static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) | |
695 | { | |
696 | struct strp_msg *rxm = strp_msg(skb); | |
eb3d38d5 | 697 | int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; |
4799ac81 BP |
698 | struct sk_buff *skb_iter, *unused; |
699 | struct scatterlist sg[1]; | |
700 | char *orig_buf, *buf; | |
701 | ||
702 | orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + | |
703 | TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); | |
704 | if (!orig_buf) | |
705 | return -ENOMEM; | |
706 | buf = orig_buf; | |
707 | ||
708 | nsg = skb_cow_data(skb, 0, &unused); | |
709 | if (unlikely(nsg < 0)) { | |
710 | err = nsg; | |
711 | goto free_buf; | |
712 | } | |
713 | ||
714 | sg_init_table(sg, 1); | |
715 | sg_set_buf(&sg[0], buf, | |
716 | rxm->full_len + TLS_HEADER_SIZE + | |
717 | TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
aeb11ff0 JK |
718 | err = skb_copy_bits(skb, offset, buf, |
719 | TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); | |
720 | if (err) | |
721 | goto free_buf; | |
4799ac81 BP |
722 | |
723 | /* We are interested only in the decrypted data not the auth */ | |
724 | err = decrypt_skb(sk, skb, sg); | |
725 | if (err != -EBADMSG) | |
726 | goto free_buf; | |
727 | else | |
728 | err = 0; | |
729 | ||
eb3d38d5 | 730 | data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; |
4799ac81 | 731 | |
97e1caa5 | 732 | if (skb_pagelen(skb) > offset) { |
eb3d38d5 | 733 | copy = min_t(int, skb_pagelen(skb) - offset, data_len); |
4799ac81 | 734 | |
aeb11ff0 JK |
735 | if (skb->decrypted) { |
736 | err = skb_store_bits(skb, offset, buf, copy); | |
737 | if (err) | |
738 | goto free_buf; | |
739 | } | |
4799ac81 | 740 | |
97e1caa5 JK |
741 | offset += copy; |
742 | buf += copy; | |
743 | } | |
4799ac81 | 744 | |
eb3d38d5 | 745 | pos = skb_pagelen(skb); |
4799ac81 | 746 | skb_walk_frags(skb, skb_iter) { |
eb3d38d5 JK |
747 | int frag_pos; |
748 | ||
749 | /* Practically all frags must belong to msg if reencrypt | |
750 | * is needed with current strparser and coalescing logic, | |
751 | * but strparser may "get optimized", so let's be safe. | |
752 | */ | |
753 | if (pos + skb_iter->len <= offset) | |
754 | goto done_with_frag; | |
755 | if (pos >= data_len + rxm->offset) | |
756 | break; | |
757 | ||
758 | frag_pos = offset - pos; | |
759 | copy = min_t(int, skb_iter->len - frag_pos, | |
760 | data_len + rxm->offset - offset); | |
4799ac81 | 761 | |
aeb11ff0 JK |
762 | if (skb_iter->decrypted) { |
763 | err = skb_store_bits(skb_iter, frag_pos, buf, copy); | |
764 | if (err) | |
765 | goto free_buf; | |
766 | } | |
4799ac81 BP |
767 | |
768 | offset += copy; | |
769 | buf += copy; | |
eb3d38d5 JK |
770 | done_with_frag: |
771 | pos += skb_iter->len; | |
4799ac81 BP |
772 | } |
773 | ||
774 | free_buf: | |
775 | kfree(orig_buf); | |
776 | return err; | |
777 | } | |
778 | ||
779 | int tls_device_decrypted(struct sock *sk, struct sk_buff *skb) | |
780 | { | |
781 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
782 | struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); | |
783 | int is_decrypted = skb->decrypted; | |
784 | int is_encrypted = !is_decrypted; | |
785 | struct sk_buff *skb_iter; | |
786 | ||
4799ac81 BP |
787 | /* Check if all the data is decrypted already */ |
788 | skb_walk_frags(skb, skb_iter) { | |
789 | is_decrypted &= skb_iter->decrypted; | |
790 | is_encrypted &= !skb_iter->decrypted; | |
791 | } | |
792 | ||
793 | ctx->sw.decrypted |= is_decrypted; | |
794 | ||
f953d33b | 795 | /* Return immediately if the record is either entirely plaintext or |
4799ac81 BP |
796 | * entirely ciphertext. Otherwise handle reencrypt partially decrypted |
797 | * record. | |
798 | */ | |
f953d33b JK |
799 | if (is_decrypted) { |
800 | ctx->resync_nh_reset = 1; | |
801 | return 0; | |
802 | } | |
803 | if (is_encrypted) { | |
804 | tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); | |
805 | return 0; | |
806 | } | |
807 | ||
808 | ctx->resync_nh_reset = 1; | |
809 | return tls_device_reencrypt(sk, skb); | |
4799ac81 BP |
810 | } |
811 | ||
9e995797 JK |
812 | static void tls_device_attach(struct tls_context *ctx, struct sock *sk, |
813 | struct net_device *netdev) | |
814 | { | |
815 | if (sk->sk_destruct != tls_device_sk_destruct) { | |
816 | refcount_set(&ctx->refcount, 1); | |
817 | dev_hold(netdev); | |
818 | ctx->netdev = netdev; | |
819 | spin_lock_irq(&tls_device_lock); | |
820 | list_add_tail(&ctx->list, &tls_device_list); | |
821 | spin_unlock_irq(&tls_device_lock); | |
822 | ||
823 | ctx->sk_destruct = sk->sk_destruct; | |
824 | sk->sk_destruct = tls_device_sk_destruct; | |
825 | } | |
826 | } | |
827 | ||
e8f69799 IL |
828 | int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) |
829 | { | |
830 | u16 nonce_size, tag_size, iv_size, rec_seq_size; | |
4509de14 VG |
831 | struct tls_context *tls_ctx = tls_get_ctx(sk); |
832 | struct tls_prot_info *prot = &tls_ctx->prot_info; | |
e8f69799 | 833 | struct tls_record_info *start_marker_record; |
d80a1b9d | 834 | struct tls_offload_context_tx *offload_ctx; |
e8f69799 IL |
835 | struct tls_crypto_info *crypto_info; |
836 | struct net_device *netdev; | |
837 | char *iv, *rec_seq; | |
838 | struct sk_buff *skb; | |
e8f69799 | 839 | __be64 rcd_sn; |
90962b48 | 840 | int rc; |
e8f69799 IL |
841 | |
842 | if (!ctx) | |
90962b48 | 843 | return -EINVAL; |
e8f69799 | 844 | |
90962b48 JK |
845 | if (ctx->priv_ctx_tx) |
846 | return -EEXIST; | |
e8f69799 IL |
847 | |
848 | start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); | |
90962b48 JK |
849 | if (!start_marker_record) |
850 | return -ENOMEM; | |
e8f69799 | 851 | |
d80a1b9d | 852 | offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); |
e8f69799 IL |
853 | if (!offload_ctx) { |
854 | rc = -ENOMEM; | |
855 | goto free_marker_record; | |
856 | } | |
857 | ||
86029d10 | 858 | crypto_info = &ctx->crypto_send.info; |
618bac45 JK |
859 | if (crypto_info->version != TLS_1_2_VERSION) { |
860 | rc = -EOPNOTSUPP; | |
861 | goto free_offload_ctx; | |
862 | } | |
863 | ||
e8f69799 IL |
864 | switch (crypto_info->cipher_type) { |
865 | case TLS_CIPHER_AES_GCM_128: | |
866 | nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
867 | tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; | |
868 | iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; | |
869 | iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; | |
870 | rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; | |
871 | rec_seq = | |
872 | ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; | |
873 | break; | |
874 | default: | |
875 | rc = -EINVAL; | |
876 | goto free_offload_ctx; | |
877 | } | |
878 | ||
89fec474 JK |
879 | /* Sanity-check the rec_seq_size for stack allocations */ |
880 | if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { | |
881 | rc = -EINVAL; | |
882 | goto free_offload_ctx; | |
883 | } | |
884 | ||
ab232e61 JK |
885 | prot->version = crypto_info->version; |
886 | prot->cipher_type = crypto_info->cipher_type; | |
4509de14 VG |
887 | prot->prepend_size = TLS_HEADER_SIZE + nonce_size; |
888 | prot->tag_size = tag_size; | |
889 | prot->overhead_size = prot->prepend_size + prot->tag_size; | |
890 | prot->iv_size = iv_size; | |
e8f69799 IL |
891 | ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, |
892 | GFP_KERNEL); | |
893 | if (!ctx->tx.iv) { | |
894 | rc = -ENOMEM; | |
895 | goto free_offload_ctx; | |
896 | } | |
897 | ||
898 | memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); | |
899 | ||
4509de14 | 900 | prot->rec_seq_size = rec_seq_size; |
969d5090 | 901 | ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); |
e8f69799 IL |
902 | if (!ctx->tx.rec_seq) { |
903 | rc = -ENOMEM; | |
904 | goto free_iv; | |
905 | } | |
e8f69799 IL |
906 | |
907 | rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); | |
908 | if (rc) | |
909 | goto free_rec_seq; | |
910 | ||
911 | /* start at rec_seq - 1 to account for the start marker record */ | |
912 | memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); | |
913 | offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; | |
914 | ||
915 | start_marker_record->end_seq = tcp_sk(sk)->write_seq; | |
916 | start_marker_record->len = 0; | |
917 | start_marker_record->num_frags = 0; | |
918 | ||
919 | INIT_LIST_HEAD(&offload_ctx->records_list); | |
920 | list_add_tail(&start_marker_record->list, &offload_ctx->records_list); | |
921 | spin_lock_init(&offload_ctx->lock); | |
895262d8 BP |
922 | sg_init_table(offload_ctx->sg_tx_data, |
923 | ARRAY_SIZE(offload_ctx->sg_tx_data)); | |
e8f69799 IL |
924 | |
925 | clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); | |
926 | ctx->push_pending_record = tls_device_push_pending_record; | |
e8f69799 IL |
927 | |
928 | /* TLS offload is greatly simplified if we don't send | |
929 | * SKBs where only part of the payload needs to be encrypted. | |
930 | * So mark the last skb in the write queue as end of record. | |
931 | */ | |
932 | skb = tcp_write_queue_tail(sk); | |
933 | if (skb) | |
934 | TCP_SKB_CB(skb)->eor = 1; | |
935 | ||
e8f69799 IL |
936 | netdev = get_netdev_for_sock(sk); |
937 | if (!netdev) { | |
938 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
939 | rc = -EINVAL; | |
3544c98a | 940 | goto disable_cad; |
e8f69799 IL |
941 | } |
942 | ||
943 | if (!(netdev->features & NETIF_F_HW_TLS_TX)) { | |
944 | rc = -ENOTSUPP; | |
945 | goto release_netdev; | |
946 | } | |
947 | ||
948 | /* Avoid offloading if the device is down | |
949 | * We don't want to offload new flows after | |
950 | * the NETDEV_DOWN event | |
3544c98a JK |
951 | * |
952 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
953 | * handler thus protecting from the device going down before | |
954 | * ctx was added to tls_device_list. | |
e8f69799 | 955 | */ |
3544c98a | 956 | down_read(&device_offload_lock); |
e8f69799 IL |
957 | if (!(netdev->flags & IFF_UP)) { |
958 | rc = -EINVAL; | |
3544c98a | 959 | goto release_lock; |
e8f69799 IL |
960 | } |
961 | ||
962 | ctx->priv_ctx_tx = offload_ctx; | |
963 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, | |
86029d10 | 964 | &ctx->crypto_send.info, |
e8f69799 IL |
965 | tcp_sk(sk)->write_seq); |
966 | if (rc) | |
3544c98a | 967 | goto release_lock; |
e8f69799 | 968 | |
4799ac81 | 969 | tls_device_attach(ctx, sk, netdev); |
3544c98a | 970 | up_read(&device_offload_lock); |
e8f69799 | 971 | |
e8f69799 IL |
972 | /* following this assignment tls_is_sk_tx_device_offloaded |
973 | * will return true and the context might be accessed | |
974 | * by the netdev's xmit function. | |
975 | */ | |
4799ac81 BP |
976 | smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); |
977 | dev_put(netdev); | |
90962b48 JK |
978 | |
979 | return 0; | |
e8f69799 | 980 | |
e8f69799 IL |
981 | release_lock: |
982 | up_read(&device_offload_lock); | |
3544c98a JK |
983 | release_netdev: |
984 | dev_put(netdev); | |
985 | disable_cad: | |
e8f69799 IL |
986 | clean_acked_data_disable(inet_csk(sk)); |
987 | crypto_free_aead(offload_ctx->aead_send); | |
988 | free_rec_seq: | |
989 | kfree(ctx->tx.rec_seq); | |
990 | free_iv: | |
991 | kfree(ctx->tx.iv); | |
992 | free_offload_ctx: | |
993 | kfree(offload_ctx); | |
994 | ctx->priv_ctx_tx = NULL; | |
995 | free_marker_record: | |
996 | kfree(start_marker_record); | |
e8f69799 IL |
997 | return rc; |
998 | } | |
999 | ||
4799ac81 BP |
1000 | int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) |
1001 | { | |
1002 | struct tls_offload_context_rx *context; | |
1003 | struct net_device *netdev; | |
1004 | int rc = 0; | |
1005 | ||
618bac45 JK |
1006 | if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) |
1007 | return -EOPNOTSUPP; | |
1008 | ||
4799ac81 BP |
1009 | netdev = get_netdev_for_sock(sk); |
1010 | if (!netdev) { | |
1011 | pr_err_ratelimited("%s: netdev not found\n", __func__); | |
3544c98a | 1012 | return -EINVAL; |
4799ac81 BP |
1013 | } |
1014 | ||
1015 | if (!(netdev->features & NETIF_F_HW_TLS_RX)) { | |
4799ac81 BP |
1016 | rc = -ENOTSUPP; |
1017 | goto release_netdev; | |
1018 | } | |
1019 | ||
1020 | /* Avoid offloading if the device is down | |
1021 | * We don't want to offload new flows after | |
1022 | * the NETDEV_DOWN event | |
3544c98a JK |
1023 | * |
1024 | * device_offload_lock is taken in tls_devices's NETDEV_DOWN | |
1025 | * handler thus protecting from the device going down before | |
1026 | * ctx was added to tls_device_list. | |
4799ac81 | 1027 | */ |
3544c98a | 1028 | down_read(&device_offload_lock); |
4799ac81 BP |
1029 | if (!(netdev->flags & IFF_UP)) { |
1030 | rc = -EINVAL; | |
3544c98a | 1031 | goto release_lock; |
4799ac81 BP |
1032 | } |
1033 | ||
1034 | context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); | |
1035 | if (!context) { | |
1036 | rc = -ENOMEM; | |
3544c98a | 1037 | goto release_lock; |
4799ac81 | 1038 | } |
f953d33b | 1039 | context->resync_nh_reset = 1; |
4799ac81 BP |
1040 | |
1041 | ctx->priv_ctx_rx = context; | |
1042 | rc = tls_set_sw_offload(sk, ctx, 0); | |
1043 | if (rc) | |
1044 | goto release_ctx; | |
1045 | ||
1046 | rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, | |
86029d10 | 1047 | &ctx->crypto_recv.info, |
4799ac81 | 1048 | tcp_sk(sk)->copied_seq); |
e49d268d | 1049 | if (rc) |
4799ac81 | 1050 | goto free_sw_resources; |
4799ac81 BP |
1051 | |
1052 | tls_device_attach(ctx, sk, netdev); | |
90962b48 JK |
1053 | up_read(&device_offload_lock); |
1054 | ||
1055 | dev_put(netdev); | |
1056 | ||
1057 | return 0; | |
4799ac81 BP |
1058 | |
1059 | free_sw_resources: | |
62ef81d5 | 1060 | up_read(&device_offload_lock); |
4799ac81 | 1061 | tls_sw_free_resources_rx(sk); |
62ef81d5 | 1062 | down_read(&device_offload_lock); |
4799ac81 BP |
1063 | release_ctx: |
1064 | ctx->priv_ctx_rx = NULL; | |
4799ac81 BP |
1065 | release_lock: |
1066 | up_read(&device_offload_lock); | |
3544c98a JK |
1067 | release_netdev: |
1068 | dev_put(netdev); | |
4799ac81 BP |
1069 | return rc; |
1070 | } | |
1071 | ||
1072 | void tls_device_offload_cleanup_rx(struct sock *sk) | |
1073 | { | |
1074 | struct tls_context *tls_ctx = tls_get_ctx(sk); | |
1075 | struct net_device *netdev; | |
1076 | ||
1077 | down_read(&device_offload_lock); | |
1078 | netdev = tls_ctx->netdev; | |
1079 | if (!netdev) | |
1080 | goto out; | |
1081 | ||
4799ac81 BP |
1082 | netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, |
1083 | TLS_OFFLOAD_CTX_DIR_RX); | |
1084 | ||
1085 | if (tls_ctx->tx_conf != TLS_HW) { | |
1086 | dev_put(netdev); | |
1087 | tls_ctx->netdev = NULL; | |
1088 | } | |
1089 | out: | |
1090 | up_read(&device_offload_lock); | |
4799ac81 BP |
1091 | tls_sw_release_resources_rx(sk); |
1092 | } | |
1093 | ||
e8f69799 IL |
1094 | static int tls_device_down(struct net_device *netdev) |
1095 | { | |
1096 | struct tls_context *ctx, *tmp; | |
1097 | unsigned long flags; | |
1098 | LIST_HEAD(list); | |
1099 | ||
1100 | /* Request a write lock to block new offload attempts */ | |
1101 | down_write(&device_offload_lock); | |
1102 | ||
1103 | spin_lock_irqsave(&tls_device_lock, flags); | |
1104 | list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { | |
1105 | if (ctx->netdev != netdev || | |
1106 | !refcount_inc_not_zero(&ctx->refcount)) | |
1107 | continue; | |
1108 | ||
1109 | list_move(&ctx->list, &list); | |
1110 | } | |
1111 | spin_unlock_irqrestore(&tls_device_lock, flags); | |
1112 | ||
1113 | list_for_each_entry_safe(ctx, tmp, &list, list) { | |
4799ac81 BP |
1114 | if (ctx->tx_conf == TLS_HW) |
1115 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1116 | TLS_OFFLOAD_CTX_DIR_TX); | |
1117 | if (ctx->rx_conf == TLS_HW) | |
1118 | netdev->tlsdev_ops->tls_dev_del(netdev, ctx, | |
1119 | TLS_OFFLOAD_CTX_DIR_RX); | |
e52972c1 JK |
1120 | WRITE_ONCE(ctx->netdev, NULL); |
1121 | smp_mb__before_atomic(); /* pairs with test_and_set_bit() */ | |
1122 | while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags)) | |
1123 | usleep_range(10, 200); | |
e8f69799 IL |
1124 | dev_put(netdev); |
1125 | list_del_init(&ctx->list); | |
1126 | ||
1127 | if (refcount_dec_and_test(&ctx->refcount)) | |
1128 | tls_device_free_ctx(ctx); | |
1129 | } | |
1130 | ||
1131 | up_write(&device_offload_lock); | |
1132 | ||
1133 | flush_work(&tls_device_gc_work); | |
1134 | ||
1135 | return NOTIFY_DONE; | |
1136 | } | |
1137 | ||
1138 | static int tls_dev_event(struct notifier_block *this, unsigned long event, | |
1139 | void *ptr) | |
1140 | { | |
1141 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1142 | ||
c3f4a6c3 JK |
1143 | if (!dev->tlsdev_ops && |
1144 | !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) | |
e8f69799 IL |
1145 | return NOTIFY_DONE; |
1146 | ||
1147 | switch (event) { | |
1148 | case NETDEV_REGISTER: | |
1149 | case NETDEV_FEAT_CHANGE: | |
4799ac81 | 1150 | if ((dev->features & NETIF_F_HW_TLS_RX) && |
eeb2efaf | 1151 | !dev->tlsdev_ops->tls_dev_resync) |
4799ac81 BP |
1152 | return NOTIFY_BAD; |
1153 | ||
e8f69799 IL |
1154 | if (dev->tlsdev_ops && |
1155 | dev->tlsdev_ops->tls_dev_add && | |
1156 | dev->tlsdev_ops->tls_dev_del) | |
1157 | return NOTIFY_DONE; | |
1158 | else | |
1159 | return NOTIFY_BAD; | |
1160 | case NETDEV_DOWN: | |
1161 | return tls_device_down(dev); | |
1162 | } | |
1163 | return NOTIFY_DONE; | |
1164 | } | |
1165 | ||
1166 | static struct notifier_block tls_dev_notifier = { | |
1167 | .notifier_call = tls_dev_event, | |
1168 | }; | |
1169 | ||
1170 | void __init tls_device_init(void) | |
1171 | { | |
1172 | register_netdevice_notifier(&tls_dev_notifier); | |
1173 | } | |
1174 | ||
1175 | void __exit tls_device_cleanup(void) | |
1176 | { | |
1177 | unregister_netdevice_notifier(&tls_dev_notifier); | |
1178 | flush_work(&tls_device_gc_work); | |
494bc1d2 | 1179 | clean_acked_data_flush(); |
e8f69799 | 1180 | } |